Make sure to throw in brick workouts so you get used to running after biking. Although I hated doing them, my coach gave me double (and triple) brick workouts last year. They were quite effective.
You don't say where your race will be, but chances are, if it occurs in August, it could be hot. One way that half ironmans differ from olympics is that the run occurs later in the day and usually puts you in the worst heat. Depending on your speed, the start time, chances are you'll be running sometime between 10 and 1. You will need to get used to running in the heat of the day. Eagleman last year was over 90 degrees and 90% humidity by the time that the run started.
Here are my favorite strategies for dealing with heat in race conditions:
1) Wear a hat. It keeps you cooler. Put ice in the cap at every aid station.
2) Wear a jersey with a back pocket. Put ice in that back pocket.
3) If it's really hot, put ice in your shorts. This can be a quite effective cooling mechanism.
4) If there's any opportunity to run off of blacktop, take it. Asphault is much hotter than grass.
5) Monitor your heart rate. If it starts spiking, slow it down. Walk if you need to.
6) Use electrolyte capsules.
7) Stay hydrated, but make sure to avoid hyponutremia.